The expression is
.
(Divide,
)
Observe that the decimal (0.19) of the number is repeating, so the number
is a rational number.
§ Observe the Venn diagram:
\§ The number
is not a Natural number (N), not a Whole number (W), and not an Integer (Z).
§ The number
is a rational number (Q). \ \
§ All rational numbers (Q) are real numbers (R), 
The number
belongs to Q and R.